Source: Wikipedia
Source: Esri
Source: Bolstad, GIS Fundamentals
Source: Bolstad, GIS Fundamentals
Source: Bolstad, GIS Fundamentals
Source: Esri
Source: Esri
Tutorial!
Server URL: http://traffic.arcgis.com/arcgis
Source: Esri
In a GIS context, a gravity model can be specified as:
\[P_{ij} = \dfrac{W_i/D_{ij}^\alpha}{\sum_{i=1}^{n}(W_i/D_{ij}^\alpha)}\]
Where:
\(P_{ij}\) = the probability of customer \(j\) shopping at store \(i\);
\(W_i\) = some measure of the attractiveness of each store \(i\);
\(D_{ij}\) = the distance from customer \(j\) to store \(i\);
\(\alpha\) = a distance-decay parameter